CN1576377A - System and method for recycling slag from stainless steel refiner - Google Patents
System and method for recycling slag from stainless steel refiner Download PDFInfo
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- CN1576377A CN1576377A CNA031581706A CN03158170A CN1576377A CN 1576377 A CN1576377 A CN 1576377A CN A031581706 A CNA031581706 A CN A031581706A CN 03158170 A CN03158170 A CN 03158170A CN 1576377 A CN1576377 A CN 1576377A
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- rotary cooler
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- 239000002893 slag Substances 0.000 title claims abstract description 322
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 19
- 239000010935 stainless steel Substances 0.000 title claims abstract description 19
- 238000004064 recycling Methods 0.000 title claims description 64
- 238000000034 method Methods 0.000 title claims description 31
- 238000012216 screening Methods 0.000 claims abstract description 35
- 238000003860 storage Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims description 51
- 239000002245 particle Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 22
- 238000006253 efflorescence Methods 0.000 claims description 17
- 206010037844 rash Diseases 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000010298 pulverizing process Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 6
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- 238000011084 recovery Methods 0.000 abstract description 3
- 241000237858 Gastropoda Species 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000035611 feeding Effects 0.000 description 5
- 230000014509 gene expression Effects 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
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- 239000001506 calcium phosphate Substances 0.000 description 4
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 4
- 229940038472 dicalcium phosphate Drugs 0.000 description 4
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
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- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses a recovery and reuse system for slag produced by stainless steel refining furnace, which is characterized in that slag is stored in a slag pot for air cooling, and transported to a workshop by a transport device; in the workshop the slag is separated from the slag pot. An external force is exerted on the slag block separated from the slag pot by a smashing device. A plurality of small fragments are separated from the smashed slugs by a small fragment separating device. A hollow cylindrical rotary cooler is provided with a pair of opposite terminals, which is driven to be rotated towards one direction. The slag discharged from the rotary cooler is received by a screening device, and the slag of 0.25 mm in size or smaller slag is separated. The slag of 0.25 mm in size or smaller slag is stored in a storage hopper.
Description
Technical field
The present invention relates to the system and method for recycling slag from stainless steel refining stove, in more detail, its utilizes when slag cools down the physical properties with slag atomizing slag efflorescence mechanism and clinker dust, without the drying process of water treatment and wet sludge, so that in a limited space, finish without detriment to the drying treatment of environment and slag with low cost.
Background technology
When refining stainless steel in a stainless steel precision furnace, de-carbon of one side oxygen blast, after de-carbon, the chromic oxide that generally will produce in the de-carbon process reduces then.The alkalescence of refining slag (below be referred to as " slag ") adjusted to be about in 1.8 to 2.5 the scope, so that improve reduction efficiency and promote the sulphur removal process.
After finishing the stainless reduction of fused, the alkalescence of slag is adjusted near 2.Overwhelming majority slag has the crystalline structure of Dicalcium Phosphate (Feed Grade) (2CaOSiO2), comprises CaO and SiO2 as main component, and contains other metal oxide of trace.
The main component of Dicalcium Phosphate (Feed Grade) or slag is cooled off lentamente from the molten state of heat, with the experience phase transformation.Then, Dicalcium Phosphate (Feed Grade) is accompanied by volumetric expansion, causes the efflorescence of slag, thereby when slag was cooled, it can spontaneously efflorescence.
Different with the slag of other type that produces from typical ironworks, the efflorescence of this slag need not the broken process of any pulverizing, make slag naturally efflorescence become fine dust granules.According to report, the efflorescence of slag is because when slag cools off, and according to temperature range, Dicalcium Phosphate (Feed Grade) is transformed into several phases, α for example, and α ' causes mutually with γ.
That is, in typical air-process of cooling, slag press α, and α ' and γ order mutually experiences phase transformation, and wherein, α has mutually and is about 3.07 density, and α ' has mutually and is about 3.31 density, and γ has mutually and is about 2.97 density.Changing to the γ phase time mutually from α ' phase, it is about 10% that the volume of slag expands at least, thereby when it cooled off, slag was become fine dust by efflorescence.
Hot slag is carried out recycling according to a wet processing.As shown in figure 11, hot slag is discharged in the jar from the electric furnace or the refining furnace of ironworks.After outdoor abundant cooling, slag is transported to a by product handles the place.Utilization plays a part the crusher 111 of shredding unit pulverizes the refrigerative slag, and the slag of having pulverized is fed on the diagrid 112 continuously.The benchmark particle size or less than the pulverized slag of this size by diagrid 112, be fed into first and second jaw crushers 113 and 114 then continuously, so that carry out fragmentation second time.The slag that surpasses the benchmark particle size can not pass through diagrid 112, and is fed into crusher 111 once more, carries out fragmentation once more.
After carrying out the fragmentation second time by first and second jaw crushers 113,114, slag is fed in the rod mill 115, mix forming wet slag with water at this place's slag.Make on the wet slag landing screen cloth unit 116, stainless steel factory is separated and turned back to this screen cloth with the skeleton particle of predetermined size from wet slag, and the wet slag that will sieve is fed on the sorter 117.Sorter 117 is separated slag from coarse sand, described coarse sand is sold as roadbed material.
After coarse sand being eliminated, utilizing thickener 118 slag that will wet to carry out concentrating the first time, and dewater with drum strainer 119 with sorter 117.The sludge of dehydration is discharged into a waste residue landfill place, and the wet slag that comprises 10 to 20% moisture is retained in the drum strainer 119 and is fed in the rotatory drier 120.
The result is, the remaining wet slag that contains 10 to 20% the moisture of having an appointment is by heating in rotatory drier 120 and stirring is dried, and then, the sludge that exsiccant is fine carries out recycling as the raw material of silicate fertilizer and cement.
Traditional slag-recycling process is fed into water and is used to pulverize slag in the rod mill, so that make wet sludge, therefore, is favourable for the amount that reduces the dust that scatters when pulverizing slag.But, this process need water treatment system, for example thickener 118 and drum strainer 119 are so that handle waste water for the second time.To after water treatment because dry and stir the moisture eliminator 120 of wet slag, a high temperature heat source need be set.Consequently, additional water treatment system has increased the size that whole recovery is utilized system again, needs a large amount of maintenance costs and too much operator, and simultaneously, the waste water that drum strainer 119 is discharged can cause the pollution of water.
Summary of the invention
The intent of the present invention is in order to address the above problem, therefore an object of the present invention is, the system and method for the slag that a kind of recycling produces from stainless steel refining stove is provided, described method and system utilization along with the cooling of slag by the physical properties of atomizing slag efflorescence mechanism and clinker dust, without the drying process of water treatment and wet sludge, so that in a limited space, finish without detriment to the drying treatment of environment and slag with low cost.
According to a scheme of the present invention,, provide the system of a kind of recycling by the slag that produces in the stainless steel precision furnace in order to realize this purpose.This slag recycling system comprises: a receiver that is used to store slag; Transporter is used for receiver is transported in the workshop by air cooled slag, and slag is separated from receiver; Shredding unit is used for applying external force to the slag bear of separating from receiver; The fine grained chippings tripping device, the slag that allows to pulverize separates fine grained chippings by the fine grained chippings tripping device with the slag of pulverizing; A hollow circular cylinder formula rotary cooler, this water cooler has the end of a pair of subtend and is rotated to a direction by a drive source, wherein, the slag that described rotary cooler is classified by the fine grained chippings tripping device via first end acceptance, and along direction feeder house outer air cooling and the efflorescence slag opposite, will cool off simultaneously with the atomizing slag and discharge from second end with the slag direction of feed by forcibly; Screening plant is used to accept the slag of discharging from rotary cooler, and slag is sub-elected less than 0.25mm or smaller szie; Storage hopper, what be used to store screened device sorting has 0.25mm size or a littler slag.
In order to realize this purpose, scheme according to another preferred provides the method for the slag that a kind of recycling produces from a stainless steel precision furnace.Described slag-recycling method may further comprise the steps: air cooled slag is stored in the receiver; Utilize a shredding unit by on slag bear, applying external force, pulverize the slag bear of from receiver, separating; The slag that makes pulverizing is by a fine grained chippings tripping device, so that the fine grained chippings that will be included in the slag separates; To be fed into a hollow circuit cylinder formula rotary cooler by the slag that the fine grained chippings tripping device is separated and with the slag efflorescence, described rotary cooler is rotated to a direction by a drive source, and forcibly with outside air along with side's feeding in the opposite direction of slag feeding; To be fed into from the slag that rotary cooler is discharged the screening plant, so that with slag branch hank about 0.25mm or littler particle size; To be that 0.25mm or littler slag are stored in the storage hopper by the granular size of screening plant sorting.
The simple description of accompanying drawing
Above-mentioned purpose of the present invention and other purpose, characteristics and other advantage, it is clearer to become from the description of carrying out with reference to the accompanying drawings, wherein:
Fig. 1 is an expression according to the concept map that is used for system's entire structure of the slag that recycling generates from stainless steel refining stove of the present invention;
Fig. 2 a and 2b, be the skeleton view that is used to transport and topple over the vehicle of receiver in the system according to recycling slag of the present invention;
Fig. 3 a and 3b be utilize in the system according to recycling slag of the present invention shredding unit carry out crushing operation diagram;
Fig. 4 is one and is used for representing according to the shredding unit of the system of recycling slag of the present invention and the concept map of fine grained chippings tripping device;
Fig. 5 is the enlarged view of expression according to the bottom part of the fine grained chippings tripping device in the slag recycling of the present invention system;
Fig. 6 is one and is used for representing the concept map according to the rotary cooler of slag recycling of the present invention system;
Fig. 7 a and 7b be expression according to the section of the rotary cooler in the slag recycling of the present invention system and and skeleton diagram; Fig. 8 a to 8c is the sectional view of first and second mixing parts of the rotary cooler in slag recycling according to the present invention system;
Fig. 9 is the concept map that is used for representing according to first emergency unit of slag recycling of the present invention system;
Figure 10 be used to illustrate according to slag recycling of the present invention system the concept map of second emergency unit;
Figure 11 is the schema that traditional hydrometallurgic recovery of being used to illustrate the slag that produces from a stainless steel precision furnace is utilized technology again.
Embodiment
Following detailed is introduced the preferred embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is an expression according to the concept map that is used for system's entire structure of the slag that recycling generates from stainless steel refining stove of the present invention, and Fig. 2 a and 2b are the skeleton views that is used to transport and topple over the vehicle of receiver in the system according to recycling slag of the present invention.
Utilize slag recycling of the present invention system 1, the slag that will discharge as byproduct from stainless steel refining stove in the refining process of steel is processed into dried material, makes it possible to the slag environmental sound that will do and carries out recycling expeditiously.As shown in Figure 1, slag recycling of the present invention system 1 comprises 40, one screening plants 60 of 30, one fine grained chippings tripping devices of 20, one shredding units of 10, one vehicles of a receiver and storage hopper 70.
The jar 10 of filling slag is transported in the cooling space via the vehicle 20 that plays transportation function, the gudgeon 11 of the receiver 10 that its arm 21 clampings of these vehicle 20 usefulness are laterally given prominence to from the receiver 10.
From stainless steel refining stove, discharge and be stored in the slag in the receiver 10, have about 1600 ℃ temperature.After one to two day, slag is cooled to the temperature about 600 ℃ in the outside atmosphere of the standard temperature in being exposed to cooling space.
Utilize vehicle 20, by being suspended on the arm 21, the receiver 10 that is filled with air cooled slag is transported among the M of workshop, at this place, arm 21 is inverted, and receiver 10 is inverted, and slag is poured out from receiver 10.
The slag bear of shredding unit 30 on the floor that is deposited in workshop M applies external force, slag bear is ground into the slag fritter with about 250mm or littler diameter.
Fig. 3 a and 3b are illustrated in according to utilizing shredding unit to carry out the diagram of powder operation in the slag reclaiming of the present invention system.
Shown in Fig. 3 a, shredding unit 30 comprises a crusher 30a, and it has an actuator arm 31, a pair of jaw 32 and pushing device 35 that is installed in the front end of actuator arm 31, wherein, jaw 32 is opened/closes so that clamping force is applied to the slag bear of pouring out from receiver 10, with its pulverizing.
Perhaps, shown in Fig. 3 b, this shredding unit 30 can comprise a crusher 30b, it has an actuator arm 33, a tup 34 that is installed on actuator arm 33 front ends, and a pushing device 36, wherein, tup 34 carries out linearity to the slag bear of pouring out repeatedly from receiver 10 impacts, so that slag is pulverized.
Because slag bear is by forming the discharging of liquid slag repeatedly in the receiver 10, in this receiver 10, the liquid slag solidifies, form many stratified zones, wherein, in the M of workshop, utilize the jaw 32 of crusher 30a or 30b or tup 34 that slag bear is pulverized, clamping force and/or impact repeat and/or are applied to continuously on the stratified zone of slag bear, so that at an easy rate slag bear is pulverized.
Equally, when utilization is had the crusher 30a pulverizing slag bear of jaw 32, shredding unit 30 utilize jaw 32 and stock pusher 35 with slag bear from being raised to the height of about 1.5m on the ground, then slag bear is fallen once more, so that under the impact of whereabouts, slag bear is ground into fragment.
Fig. 4 represents that the shredding unit and the fine grained chippings tripping device that adopt according in the slag recycling of the present invention system, Fig. 5 are the enlarged views according to the fine grained chippings tripping device bottom part that adopts in the slag recycling of the present invention system.
As shown in Figure 4, the slag fragment that the fine grained chippings tripping device allows to be pulverized by shredding unit 30 passes through, so that the slag particles of predetermined size is separated from fine grained chippings.
Fine grained chippings tripping device 40 be arranged on workshop M the floor below, and have the sieve aperture that size is about 250mm, so as to allow diameter be 250mm or more the slag particles of minor diameter pass through, but the fine grained chippings and the slag particles that stop diameter to surpass 250mm pass through.
Workshop M comprises that the slag bear that is positioned at of the top ceiling of a plurality of installations workshop M pulverizes top dust gathering arrester 42a directly over the position, is used to collect the clinker dust that produces when pulverizing slag bear.A bottom dust gathering arrester 42b is arranged on the position of close fine grained chippings tripping device 40, is used for collecting the clinker dust that produces when fine grained chippings separates slag particles.
Upper and lower dust gathering arrester 42a in turn is connected with a cyclone scrubber 43 with 42b, be mainly used in by compulsory suction by producing with the lower section, be collected in the clinker dust that generates in the M of workshop, produce and force the part of being passed through of suction to comprise: a suction tube 43a, a deep bed filter 44 that is used for being separated in the clinker dust that cyclone scrubber 43 fully do not removed, one is used for open-air is produced strong suction force so that aspirate the suction fan 45 of clinker dust forcibly, and clean air that is used for not containing clinker dust is discharged to the chimney 46 of outside usefulness.
As shown in Figure 1, a plurality of chain conveyors 81 and 82 are installed below cyclone scrubber 43 and deep bed filter 44,, and are discharged into screening plant 60 places downwards from this so that transmit by the clinker dust of cyclone scrubber 43 and deep bed filter 44 collections.Chain conveyor 81 and 82 and endless belt conveyor 88 teamworks are used for and will are cooled at a hollow circular rotary cooler 50 and are sent in the screening plant 60 by the atomizing slag.
The clinker dust of discharging from the bottom of cyclone scrubber 43 and deep bed filter 44 can be fed directly into storage hopper 70, because these clinker dust have about .25mm or littler particle size, can be used as commerical prod.
Simultaneously, a vehicle 20 that is used to allow to transport receiver 10 enters the door G that workshop M passes through, preferably be arranged on the sidewall, between being used for pulverizing the shredding unit 30 of slag bear and being used for separating between the fine grained chippings tripping device 40 of fine grained chippings from slag particles.
Because the pulverizing position of pulverizing slag bear via the open-air of door G introducing workshop M by shredding unit 30 from the outside flows to upper and lower dust gathering arrester 42a and 42b, so that form an air passageways, therefore the visibility meter that the room air that has dust of workshop M is circulated effectively to guarantee the operator improved the workability of pulverizing slag bear potentially, with preventing that temperature from rising.
Between fine grained chippings tripping device 40 and rotary cooler 50, be provided with: a hopper 48a, be used for storing the slag that falls down from fine grained chippings tripping device 40, a feeder 48b, the conveying that is used for level is from the downward slag of discharging of hopper 48a, and a ramp transfer roller 48c, be used for the slag that will discharge from feeder 48b inlet side along a ramp feed track rotary cooler 50.
Hopper 48a and feeder 48b are arranged in the pit P, are compressed on a predetermined degree of depth of fine grained chippings tripping device 40 belows.At pit P, a supplementary set dust hood 42c preferably is set, be used to be collected in the clinker dust that slag is produced when rotary cooler 50 feedings.Described supplementary set dust hood 42c is with collected clinker dust feeding road cyclone scrubber 43.
Fig. 6 is illustrated in the structure according to the rotary cooler that adopts in the slag recycling of the present invention system, and Fig. 7 a and 7b represent cross section and the profile according to the rotary cooler that adopts in the slag recycling of the present invention system.
As shown in Figure 6, rotary cooler 50 is taked the form of hollow circular cylinder, rotated to a direction by a drive source, wherein, the size that an end of rotary cooler 50 is accepted to be separated by fine grained chippings tripping device 40 is about 25mm or littler slag, make open-air forcibly blow to the direction opposite, so that cooling and efflorescence slag are cooled and are discharged from by the other end of atomizing slag by rotary cooler 50 with the slag direction of feed.
This rotary cooler 50 comprises: the hollow circular cylinder 51 with predetermined length; , a motor 52 that is used to rotate driving gear 52b, described driving gear and the annular driving gear 52a engagement of installing around a vertical middle portion of right cylinder 51; Preceding guide roller and back guide roller 53 and 54 are used to the front and rear sustained ring 53a and the 54a that support and lead and install around right cylinder 51; A charge chute 55 is used for the front end of rotatably mounted right cylinder 51 and allows slag to fall mouthful 55a by one falling; And a blowpit 56, be used for rotatably mounted right cylinder 51 the rear end, discharge and to be cooled and atomizing slag and receive the air that enters hollow circular cylinder 51 by an opening 56a.
Shown in Fig. 7 a, hollow circular cylinder 51 is divided into a charging fractional t1, one first mixing part T2, and one second mixing part T3 and a discharge fractional t1: the charging fractional t1 has a spiral slot 51a on the interior week that is formed on inlet side; The first mixing part T2 has the lining 51b in the week that sets within it, and is not subjected to the infringement of hot slag in being used to protect week, and a plurality of projection 51c that radially are provided with predetermined interval on the interior week of 51 ones of linings, is used to stir slag; The second mixing part T3 has a central shaft 51d that the center of right cylinder 51 is set regularly, and a plurality of beater 51e that radially is provided with, and the one end is fixed on the central shaft 51d, and the other end contacts with right cylinder 51 in interior week; The discharge fractional t1 will cool off also by the first and second mixing part T2 and T3, and the atomizing slag is discharged into the outside.
The charging fractional t1, it is 1,6,12 and 6 length that the first mixing part T2, the second mixing part T3 and discharge part T4 have ratio, wherein, the first and second mixing part T2 and T3 preferably are longer than charging and discharge fractional t1.
With reference to Fig. 8 A, each the interior projection 51c of the first mixing part T2 that is arranged on right cylinder 51 comprises: one has along the vane plate 501 of the sense of rotation tapered front end of right cylinder 51, a strengthening rib 502 that is used for reinforced blade plate 501, and a retaining plate 503, this retaining plate 503 plays a part to be used for vane plate and strengthening rib 501 and 502 are fixed to clamp structure on interior week of right cylinder 51.
With reference to Fig. 8 b and 8c, the beater 51e in the second mixing part T3 of right cylinder 51 extends along the longitudinal direction of right cylinder 51, and radially with different angle setting mutually, makes that adjacent beater 51e can be not overlapped.
According to preferably embodiment of the present invention, the rotation angle with about 45 degree on the central shaft 51d of right cylinder 51 is installed 4 beater 51e, but described beater is not limited to above-mentioned example, but can carry out various remodeling according to operational condition.
Each beater 51e comprises: be installed in the retaining plate 504 on the outside surface of central shaft 51d with the interval that equates, a rearward end is via clamp structure retaining plate 504 fixed vane plates 505, it has and is formed on a plurality of slit 505a that being used on vane plate 505 bodies allows slag to pass through, be installed in a plurality of strengthening rib 506 that are used for reinforced blade plate 505 at the rear portion of vane plate 505, and one have clamp structure be fixed to vane plate 505 front end and with the scraper plate 506 that contacts in interior week of right cylinder 51.
The front-end and back-end of vane plate 505 preferably form circle rather than form linear, thereby vane plate 505 can be enough to bear the load at right cylinder 51 internal cooling and atomizing slag.
Fig. 9 represents a unitary structure of emergency gate adopting in the blowpit that a unitary structure of emergency gate adopting in the charge chute according to slag recycling of the present invention system, Figure 10 are expressions according to slag recycling of the present invention system.
With reference to Fig. 6 and Fig. 9, inlet side at the charge chute 55 of rotary cooler 50, one first emergency gate unit 140 is set, be used for adjusting from what fine grained chippings tripping device 40 was discharged and be fed into the amount of the slag of charge chute via ramp transfer roller 48c, perhaps when emergency situation takes place, stop slag being fed into rotary cooler 50.The first emergency gate unit 140 comprises: the motor 141 as drive source, one by motor 141 reciprocating bars 142, and one first 143, this first is fallen mouthful 55a or an emergent conduit 145 around a hinge axis 144 rotation so that what the discharge path was transformed into charge chute 55 in bar 142 reciprocating processes.
As shown in Figure 9, under the lower end of emergent conduit 145, a case 146 is set, is used for temporarily being stored in the slag of in emergency circumstances discharging.Below charge chute 55, be provided with one and be used for temporarily being stored in via falling mouthful hopper of the slag that the process of 55a feeding falls 147, and one has slag is directed to the emergent conduit 148 of the sliding gate 148a that uses the case 146 downwards from hopper 147.
Referring again to Fig. 1, directly over first emergency gate 140 and charge chute 55, dust gathering arrester 42d and 42e are installed, they begin to extend from cyclone scrubber 43 and are used for being collected in the clinker dust that slag is produced to rotary cooler 50 whens filling with substance.
As 6 and shown in Figure 10, below the blowpit 56 that is used for cooling and atomizing slag are discharged from rotary cooler 50 usefulness, one second emergency gate unit 140a is set, is used to regulate the amount of the slag of discharging from water cooler 50 and is used for stopping under the urgent situation discharging slag to endless belt conveyor 83.The second emergency gate unit 140a comprises: one is used for temporary transient the storage from the hopper 56b of the slag of blowpit 56 discharges, motor 141a as drive source, one by the reciprocating bar 142a of motor 141a, with one in the reciprocating process of bar 142a, be used for around second 143a of hinge axis 144a rotation, so as with a discharge path be transformed into be arranged on endless belt conveyor 83 directly over main pipe 83a go up or be transformed on the emergent conduit 145a.Below the lower end of emergent conduit 145a, a case 146a is set, be used for the slag that temporary transient storage will in emergency circumstances emit.
After rotary cooler 50 ejects, be fed to be used for particulate screening plant 60 that sorting has 0.25mm or littler size before, slag is flatly carried on endless belt conveyor 83.Referring again to Fig. 1, screening plant 60 comprises 61, one Gyratory screens 62 of a vibratory screening apparatus and processing tank 63.Refrigerative and atomizing slag that vibratory screening apparatus 61 vibrations import from rotary cooler 50, so that the particle size according to about 5mm is carried out sorting to slag, make particulate slag be transported to a successive screening process or Gyratory screen 62, be transported in the processing tank 63 but particle size surpasses the slag of 5mm with about 5mm or littler size.Gyratory screen 62 accepts to be of a size of 5mm or littler slag from vibratory screening apparatus, and apply compound vibration power to slag, for example tangential movement, circular motion, elliptic motion and to-and-fro movement, make that particle size is that 0.25mm or littler slag are transported in the storage hopper 70, so that as commodity, the slag that particle size surpasses 0.25mm then is transported in the processing tank 63.
The transfer roller or the bailing bucket elevator 64 of an arranged perpendicular are set between vibratory screening apparatus 61 and Gyratory screen 62, make and in vibratory screening apparatus 61, to be transported in the Gyratory screen 62 expeditiously by the slag of sorting.
And then, between screening plant 60 and storage hopper 70, a middle hopper 63 is set, be used for the temporary transient size that sorted out in the last sorting step of screening plant 60 by Gyratory screen 62 of storing less than 0.25mm or littler slag.Middle hopper 65 has the first sliding gate 66a and the rotary valve 66c that are installed on the bottom, is used to regulate the discharging of slag.A dispatchtude 68 is set, makes and the slag utilization of discharging from middle hopper 65 pressurized air by gas blower 67 can be carried in the storage hopper 70.
Middle hopper 65 also has one second sliding gate 66b, is used in case of emergency slag being discharged to processing tank 63 from middle hopper 65.
Storage hopper 70 comprises a plurality of storage vessels with internal space of pre-sizing, is used to store about 0.25mm of the size that sorts out at last by screening plant 60 or littler slag.Each size hopper 70 all comprises a deep bed filter 71, be convenient to be transported to slag in the internal space of each hopper 70 and be collected in the clinker dust of tending to disperse in the transportation of slag, a suction fan 73 that is used to produce suction force is set at the rear of deep bed filter, with a rotary valve that is installed on the deep bed filter 71, the clinker dust that is used for catching is fed into each storage hopper 70.
Each storage hopper 70 has one and is installed on the sliding gate 74 of its bottom and one rotary valve 75, is used for slag is discharged into tank car 76, thereby can at an easy rate about 0.25mm of size or littler slag be flowed to the user.
Below, description is had the operation of the present invention of said structure.
In the stainless steel precision furnace of ironworks, produce slag, constantly be stored in the receiver 10.When the liquid slag is filled on the highest horizontal plane of receiver 10, receiver 10 is transported to a cooling space with vehicle 20.
At cooling space, receiver 10 was placed on standard temperature one day or two days, make slag be arrived about 600 ℃ temperature by air cooling.Then, vehicle 20 receiver that will be filled with air cooled slag is transported among the M of workshop.The arm 21 of vehicle 20 is inverted and makes slag be discharged on the floor of workshop M from receiver 10 receiver 10 reversings.
Perhaps, can slag bear be lifted to height about about 1.5m from ground, make then on its Crater plate, make that drop impact at first is ground into fragment with slag bear down with the jaw 32 of lorry 35 and crusher 30a.Then, apply external force and pulverize the slag fragment for the second time.
Then, will be shifted onto in the fine grained chippings tripping device 40 on the floor that is arranged on workshop M by the slag that shredding unit 30 is pulverized with the lorry 35,36 of crusher 30a, 30b.Fine grained chippings tripping device 40 allows size to be about 250mm or littler slag moves downward in the hopper 48a, can not pass through fine grained chippings tripping device 40 but size is at least about fine grained chippings and the slag fragment of 250mm.The slag that is stored in the hopper 48a is fed in the charge chute 55 of rotary cooler 50 via feeder 48b and ramp transfer roller 48c.
The clinker dust of in the process of pulverizing slag bear, in the M of workshop, dispersing, via the top dust gathering arrester 42a on the top ceiling that is installed in workshop M be installed near the fine grained chippings tripping device 40 bottom dust gathering arrester 42b, be fed in cyclone scrubber 43 and the deep bed filter 44.Clinker dust is filtered by cyclone scrubber 43 and deep bed filter 44, by means of chimney 46 air of cleaning is discharged then.
By the clinker dust that cyclone scrubber 43 and deep bed filter 44 collected, have a little 0.25mm or a littler particle size of being about, be fed to storage hopper 70 then, as commodity, or be fed on the endless belt conveyor 83, be fed in the screening plant 60.
A dust gathering arrester 42f is installed in the inlet side of endless belt conveyor 83, so that suck the dust that produces when clinker dust falls, a scraper 83b is installed on vertical middle portion of endless belt conveyor 83, is used to remove the clinker dust that remains on the band component surface.
In turn, with 160 to 200 ℃ slag, fall a mouthful 55a on the charge chute 55 via the inlet side that is arranged on rotary cooler 50 and be fed in the right cylinder 51.Right cylinder 51 is rotated to a direction by motor 52 or drive source, and described right cylinder 51 is tilted, make loading side be higher than discharge side, make and to be installed into slag in the right cylinder 51 in turn by having the charging fractional t1 of spiral slot 51a, the first mixing part T2 with projection 51c, the second mixing part T3 of beater 51e is installed, and discharge part T4, discharge via blowpit 56 up to slag.The slag that is discharged from has distribution of sizes as described in Table 1.
Table 1
| The slag particles size | Particle size distribution | |
| ????(％) | Amount to | |
| 45 μ m or littler | ????20.54 | ????20.54 |
| ????45～75μm | ????27.21 | ????47.75 |
| ????75～150μm | ????24.61 | ????72.36 |
| ????150～250μm | ????7.19 | ????79.55 |
| ????250～300μm | ????1.61 | ????81.16 |
| ????300～500μm | ????1.91 | ????83.07 |
| ????0.5～1.0mm | ????1.56 | ????84.63 |
| ????1.0～2.36mm | ????2.63 | ????87.26 |
| ????2.36～5mm | ????2.97 | ????90.23 |
| ????5～12.7mm | ????4.49 | ????94.92 |
| ????12.7～25.4mm | ????2.96 | ????97.88 |
| Surpass 25.4mm | ????1.12 | ????100 |
Under the suction of installing in order to the dust gathering arrester 42e that forcibly sucks the clinker dust that produces by charge chute, to the outlet of right cylinder 51 or discharge side and apply the negative pressure of a pact-3 to-4mmAq.Then, along with slag be fed into discharge side the side in the opposite direction, via the opening 56a that is formed on the blowpit 56 cold open-air is forcibly fed loading side, so that cool off and the slag of efflorescence heat.
Then, in the right cylinder 51 of rotary cooler 50, with hot slag cooling and efflorescence, the temperature of slag is reduced to 50 to 60 ℃, discharge downwards via blowpit 56, be loaded into then on the endless belt conveyor 83, this transfer roller 83 flatly is transported to slag in the vibratory screening apparatus 61 of screening plant 60.
Be fed into the slag in the vibratory screening apparatus 61, have particle size distribution as shown in table 1, wherein, the size that accounts for the slag of total amount 90% at least is about 5mm or littler, and remaining diameter surpasses the slag particles of 5mm at below 10% of slag total amount.Therefore, the major part of slag is passed through vibratory screening apparatus 61, and is fed in the Gyratory screen 62, and a spot of slag is transported in the processing tank 63.Because at least 79% the slag size that is fed into Gyratory screen is at 0.25mm or littler, so its major portion is by Gyratory screen 62 and be stored in the middle hopper 65.A small amount of slag that diameter surpasses 0.25mm partly is transported in the processing tank 63.
Then, slag is transported to the storage hopper 70 from middle hopper 65 by the pressurized air that is produced by gas blower 67 via dispatchtude 68, and wherein, the deep bed filter 71 that is arranged on the storage hopper 70 is collected in the dust that disperses when carrying.
Then, slag is loaded onto in the tank car 76 from storage hopper 70, gives the user.When having served as slag that volume production gives birth to and overfilling storage hopper 70, it is discharged, and in a stirrer 77 that is supplied with water, slag is mixed with water by an emergent conduit.Then, the mixture with water and slag is fed in the traditional wet type system of processing 100.
As mentioned above, the recycling apparatus and method of slag of the present invention, can pass through dry process recycling slag, described dry process utilizes slag to understand the physical properties of atomizing slag efflorescence mechanism and slag when cooling, so that shorten the treatment time of slag, thereby improve production performance.Because the present invention need not traditional water treatment system, so that the water that imports in order to carry out the wet processed slag is handled, does not also need to use the dehumidification system of thermal source, so, one-piece construction can be simplified.Consequently, slag recycling of the present invention system can be installed in a little space, so that environmental sound and recycling slag economically.
Although openly measure the preferred embodiments of the present invention with reference to certain embodiments for illustrative purposes, but those skilled in the art will be understood that, not exceeding under the described the spirit and scope of the invention situation of appended claims, can carry out various remodeling, replenish, replace.
Claims (28)
1. system that is used for the slag that recycling produces by the stainless steel precision furnace comprises:
Be used to store the receiver of slag;
Transporter is used for receiver is transported in the workshop by air cooled slag, and slag is separated from receiver;
Shredding unit is used for applying external force to the slag bear of separating from receiver;
The fine grained chippings tripping device, the slag that allows to pulverize is by the fine grained chippings tripping device, so that fine grained chippings is separated with the slag of pulverizing;
Hollow circular cylinder formula rotary cooler, this water cooler has the end of a pair of subtend and the source that is driven drives and to a direction rotation, wherein, described rotary cooler receives the slag that is sorted out by the fine grained chippings tripping device via first end, and by along the direction opposite with the slag direction of feed forcibly feeder house's outer air cool off and the efflorescence slag, and will cool off with the atomizing slag and discharge from second end;
Screening plant is used to receive the slag of discharging from rotary cooler, and sub-elects the slag of 0.25mm or smaller szie; And
Storage hopper is used to store screening plant and sub-elects and be of a size of 0.25mm or littler slag.
2. the system that is used for the recycling slag as claimed in claim 1, it is characterized in that, described shredding unit comprises crusher, this crusher comprises actuator arm and is installed in a pair of jaw of actuator arm front end, this jaw opens and closes, so that clamping force is applied on the slag bear of separating from receiver, thereby slag bear is pulverized.
3. the system that is used for the recycling slag as claimed in claim 1, it is characterized in that, described shredding unit comprises crusher, this crusher comprises actuator arm and is installed in the tup of actuator arm front end, this tup impacts linearity repeatedly and is applied on the slag bear of separating from receiver, thereby slag bear is pulverized.
4. the system that is used for the recycling slag as claimed in claim 1 is characterized in that, described fine grained chippings tripping device is arranged on the floor in workshop, and its size of mesh is about 250mm, so that be that 250mm or bigger fine grained chippings separate with size.
5. the system that is used for the recycling slag as claimed in claim 1 is characterized in that, described workshop comprises a sidewall that is arranged between shredding unit and the fine grained chippings tripping device, and is formed on and is used to the door that allows e Foerderanlage to pass through on the described sidewall.
6. the system that is used for the recycling slag as claimed in claim 1 further comprises:
Be installed in the top dust gathering arrester on the top ceiling of workshop, its position be positioned at the place of pulverizing slag directly over; And
Be provided with in the workshop and near the bottom dust gathering arrester close fine grained chippings tripping device.
7. the system that is used for the recycling slag as claimed in claim 6 further comprises:
The cyclone scrubber of the clinker dust that is used for producing between cleaning cart;
Deep bed filter is used to separate the clinker dust that is not cleaned by cyclone scrubber;
Be used to produce the suction fan of suction force; And
Be used for extracting clean air out be discharged into the outside chimney,
Wherein, described cyclone scrubber, deep bed filter, suction fan and chimney are communicated with the upper and lower dust gathering arrester.
8. the system that is used for the recycling slag as claimed in claim 1 further comprises:
Be used to store the hopper of the slag that falls from the fine grained chippings tripping device;
Be used for the feeder of horizontal feed from the downward slag of discharging of this hopper; And
The ramp transfer roller is used for a slag from the feeder discharge is transported to rotary cooler along the ramp loading side.
9. the system that is used for the recycling slag as claimed in claim 1 is characterized in that hopper and feeder are arranged in the pit, and this pit is directly suppressed downwards from the fine grained chippings tripping device and formed.
10. the system that is used for the recycling slag as claimed in claim 1 is characterized in that rotary cooler comprises:
Hollow circular cylinder, this hollow circular cylinder have around the annular driving gear of the vertical middle portion installation of this right cylinder and the front and rear ring-shaped bearing ring of installing around this right cylinder;
Be used to drive the motor of the driving gear that meshes with described driving gear;
The front and rear guide roller is used for guiding and supporting front and rear sustained ring;
Charge chute is used for rotatably mounted this cylindrical front end, and has the inlet of falling, and slag falls inlet by this and drops in this right cylinder;
Blowpit is used for rotatably mounted this cylindrical rearward end, discharge to be cooled and the atomizing slag, and formation imports cylindrical opening with air.
11. the system that is used for the recycling slag as claimed in claim 10 is characterized in that described right cylinder tilts with respect to horizontal reference line, makes its discharge side be positioned under the loading side.
12. the system that is used for the recycling slag as claimed in claim 10 is characterized in that, described right cylinder comprises:
Have spiral fluted discharge part, this spiral slot is formed near on the interior week of cylindrical discharge side;
First mixing part, it has a plurality of projections that are formed on the interior week that lining is housed, and described projection is used for stirring slag with predetermined gap radial arrangement in right cylinder;
Second mixing part has a plurality of beaters with the predetermined space radial arrangement, and each beater all has an end that is fixed on the right cylinder central shaft, and is fixed to another end on week in the right cylinder; And
The material part is used for and will be discharged to the outside in cooling of first and second mixing parts and atomizing slag.
13. the system that is used for the recycling slag as claimed in claim 12 is characterized in that, the length ratio of discharge part, first mixing part, second mixing part and discharge part is 1,6,12 and 6.
14. the system that is used for the recycling slag as claimed in claim 12 is characterized in that, beater radially with different angle setting mutually, makes that adjacent beater can be not overlapped.
15. the system that is used for the recycling slag as claimed in claim 10 further comprises the first emergency gate unit that is positioned at the charge chute inlet side, is used for stopping when emergency situation the feeding of slag, wherein, first emergency gate comprises:
By the reciprocating bar of motor; And
When the bar to-and-fro movement, center on second of the hinge axis rotation, so that the discharge path is transformed into falling inlet or being transformed into emergent conduit of charge chute.
16. the system that is used for the recycling slag as claimed in claim 10 further comprises the second emergency gate unit that is positioned at the blowpit below, is used for stopping when emergency situation the feeding of slag, wherein, second emergency gate comprises:
Be used for temporary transient the storage from the hopper of the slag of blowpit discharge;
By the reciprocating bar of motor; And
When the bar to-and-fro movement around second of hinge axis rotation so that with the discharge path be transformed into endless belt conveyor directly over or be transformed into emergent conduit.
17. the system that is used for the recycling slag as claimed in claim 10 is characterized in that screening plant comprises:
Be used for applying the vibratory screening apparatus of vibration force to slag by the rotary cooler feeding, so as with the about 5mm of particle size serve as the basis slag is carried out sorting; And
Gyratory screen is used for applying to the slag that was carried out sorting by vibratory screening apparatus and comprises tangential movement, circumferential motion, and elliptic motion and reciprocating compound vibration power are so that serve as that sorting is carried out to slag in the basis with the particle size of about 0.25mm.
18. the system that is used for the recycling slag as claimed in claim 1 further comprises:
Be arranged on the middle hopper between screening plant and the storage hopper, be used for temporarily storing the particle size that screened device sorts out at last and be about 0.25mm or littler slag; And
Dispatchtude utilizes the pressurized air that comes from gas blower to be transported to the storage hopper from the slag that middle hopper is discharged.
19. the system that is used for the recycling slag as claimed in claim 1 further comprises:
Be installed in the deep bed filter on the storage hopper, be used for being collected under the pressure clinker dust that the process of transportation slag is dispersed, so that collected clinker dust is fed in the storage hopper; And
Be arranged on the suction fan at the rear portion of deep bed filter, be used to produce suction force.
20. the method for the slag that a recycling is produced by the stainless steel precision furnace, this method may further comprise the steps:
With the slag air cooling that is stored in the receiver;
Utilize shredding unit by on slag bear, applying external force, pulverize the slag bear of from receiver, separating;
The slag that makes pulverizing is by the fine grained chippings tripping device, so that separate the fine grained chippings that is included in the slag;
To be fed into by the slag that the fine grained chippings tripping device is separated in the hollow circuit cylinder formula rotary cooler, so that with slag cooling and efflorescence, described rotary cooler is driven the source and rotates to a direction, and along the direction opposite with slag direction of feed feeder house's outer air forcibly;
To be fed into the screening plant from the slag that rotary cooler is discharged, so that sub-elect the slag of about 0.25mm or littler particle size; And
To be that 0.25mm or littler slag are stored in the storage hopper by the granular size of screening plant sorting.
21. the method for recycling slag as claimed in claim 20 is characterized in that, pulverising step comprises: the clamping force concentrated area is applied to the delamination area of slag bear, makes that slag bear is pulverized.
22. the method for recycling slag as claimed in claim 20 is characterized in that, pulverising step comprises: repeatedly linearity is impacted the delamination area that is applied to slag bear, make that slag bear is pulverized.
23. the method for recycling slag as claimed in claim 20 further may further comprise the steps:
Aspirate or be collected in the step of the clinker dust of dispersing in pulverising step and the fine grained chippings separating step, the step of described suction and collection clinker dust is utilized cyclone scrubber and deep bed filter, by being arranged on the upper and lower dust gathering arrester in the workshop, and under the effect of the suction force of suction fan, carry out; And
By chimney clean air is discharged to outside step.
24. the method for recycling slag as claimed in claim 23 is characterized in that, will be fed in the screening plant by the clinker dust that cyclone scrubber and deep bed filter are collected, and is used to sub-elect have particle size and be about 0.25mm or littler slag.
25. the method for recycling slag as claimed in claim 23 is characterized in that, will be fed into storage hopper by the clinker dust that cyclone scrubber and deep bed filter are collected.
26. the method for recycling slag as claimed in claim 20 is characterized in that, cooling and efflorescence step may further comprise the steps:
Slag is installed in the charging part of rotary cooler, described charging part has the spiral slot on week in charging of being formed on partly;
Carry out the first time and stir in first mixing part of rotary cooler, described first mixing part has a plurality of projections, and this projection is mounted thereto to be equipped with on interior week of first mixing part of lining;
In second mixing part with a plurality of beaters of rotary cooler the slag that carried out stirring for the first time being carried out the second time stirs, wherein, each beater have with the front end that contacts in interior week of rotary cooler and the central shaft that is fixed to rotary cooler on the rear end; And
To cool off and the atomizing slag is partly discharged from discharge by means of open-air, wherein, described open-air is to loading side from the side-blown of the discharge of rotary cooler.
27. the method for recycling slag as claimed in claim 20 is characterized in that, described sorting step may further comprise the steps:
Under the effect of the vibration force of vibratory screening apparatus, from cooling rotary cooler and sub-elected about 5mm or littler size in the atomizing slag;
Under tangential movement, circumferential motion, elliptic motion and the to-and-fro movement of Gyratory screen, be of a size of the slag that sub-elects about 0.25mm or smaller szie 5mm or the littler slag from the vibratory screening apparatus sorting.
28. the method for recycling slag as claimed in claim 20 further may further comprise the steps:
0.25mm will be about or littler slag temporarily is stored in the middle hopper by the size that screening plant is separated; And from the pressurized air that gas blower comes slag is fed into the storage hopper by the dispatchtude utilization.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR51608/2003 | 2003-07-25 | ||
| KR10-2003-0051608A KR100530084B1 (en) | 2003-07-25 | 2003-07-25 | An apparatus and method for recycling the slag of stainless steel refining furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1576377A true CN1576377A (en) | 2005-02-09 |
| CN1269970C CN1269970C (en) | 2006-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031581706A Expired - Fee Related CN1269970C (en) | 2003-07-25 | 2003-09-15 | System and method for recycling slag from stainless steel refiner |
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| KR (1) | KR100530084B1 (en) |
| CN (1) | CN1269970C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100467621C (en) * | 2007-07-16 | 2009-03-11 | 武汉钢铁(集团)公司 | Molten steel refining agent and preparation method |
| CN101429349B (en) * | 2007-11-07 | 2012-04-18 | 秦文隆 | Resource recycling method for stainless steel film |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101008095B1 (en) * | 2008-02-20 | 2011-01-13 | 주식회사 포스코 | Manufacturing method of binder using electro arc furncace slag of stainless steel |
| KR101164448B1 (en) | 2011-12-16 | 2012-07-12 | 김부환 | Purifying process of metal iron from base metal |
| CN116989590B (en) * | 2023-09-18 | 2023-11-28 | 包钢集团节能环保科技产业有限责任公司 | Molten steel slag waste heat recovery system and application method of recovered steel slag |
-
2003
- 2003-07-25 KR KR10-2003-0051608A patent/KR100530084B1/en active IP Right Grant
- 2003-09-15 CN CNB031581706A patent/CN1269970C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100467621C (en) * | 2007-07-16 | 2009-03-11 | 武汉钢铁(集团)公司 | Molten steel refining agent and preparation method |
| CN101429349B (en) * | 2007-11-07 | 2012-04-18 | 秦文隆 | Resource recycling method for stainless steel film |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100530084B1 (en) | 2005-11-22 |
| CN1269970C (en) | 2006-08-16 |
| KR20050012911A (en) | 2005-02-02 |
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